# Decibel vs 9011B

The clearest difference is iOS requirement: 9011B at 9.0 against Decibel's 15.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Decibel ships an update every 18 months, 9011B every 12 months. The most recent releases landed on October 21, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Decibel | 9011B |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.5 (475 ratings)](https://appshunter.io/ios/app/decibel-accurate-db-meter/id1130936133/reviews)** | — |
| Number of ratings | **475** | — |
| Positive reviews | 45.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 12 months** |
| Monetization | Free | — |
| Size | 4 MB | 23 MB |
| Requires iOS | 15.6 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [祥祎 刘](https://appshunter.io/developer/1071522659) | [Jenco Instruments, Inc.](https://appshunter.io/developer/1275832649) |

## What reviewers say

### Decibel

[App page](https://appshunter.io/ios/app/decibel-accurate-db-meter/id1130936133)

Transform your device into a professional sound meter to accurately measure ambient noise levels. Understand how loud your surroundings are, from quiet rooms to loud events, and learn about potential hearing risks.

**Highlights:** Accurate sound pressure level measurement, Measures decibels (dB), Provides real-time sound intensity readings, Useful for understanding noise pollution, Helps identify potential hearing hazards

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Simple and intuitive
- 💡 Useful for measuring noise levels
- 🚀 Easy to use
- 🔍 Provides instant and average readings

**What reviewers complain about**

- 🐛 Inaccurate readings
- 🔍 Overly sensitive microphone
- 🔍 Inconsistent measurements
- 🔍 Readings too high compared to other apps

**Reported bugs**

- App shows high decibel readings even in silent environments
- Microphone issues causing inaccurate measurements
- App freezes or stops working

**Requested features**

- Ability to calibrate the app
- Option to record and save measurement history
- Add peak hold feature
- Improve spelling and grammar


### 9011B

[App page](https://appshunter.io/ios/app/9011b/id1512549549)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Decibel free?

Decibel is free to download, with no in-app purchases.

### Is 9011B free?

9011B is free to download, with no in-app purchases.

### Do Decibel or 9011B have ads?

Neither Decibel nor 9011B shows ads.

### Which is updated more often, Decibel or 9011B?

Decibel ships an update every 18 months, and 9011B every 12 months. Most recently, Decibel was updated on October 21, 2026 and 9011B on October 25, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*